The recent literature on the modeling and control of anaerobic wastewater treatment processes is reviewed. An example from the author's personal work is used to describe how a dynamic simulation model can be developed from the basis of multi-organism growth kinetics and mass balancing techniques. This included consideration of the organic acid dissociation equilibria important for pH calculation and the thermodynamic influence of hydrogen on the reactions involving propionic and butyric acids. Liquid phase balances were linked to gas phase balances by gas-liquid transfer considerations. It is shown in detail how the model was applied to one and two stage experimental reactors for the design and tuning of controllers. Both conventional PID controllers and adaptive optimizing controllers, employing simple input-output models with an objective function, were tested.
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